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Date: Tue, 23 Feb 2010 17:32:34 +0100
Message-ID: <38A51B74B884D74083D7950AD0DD85E82A1B12@File-Server-HST.hst.e-technik.tu-darmstadt.de>
Thread-Topic: VLF_8.79 kHz_grounding systems
Thread-Index: Acq0nlgrgPGVQm5OS1ydzGOJ574hIwAALueg
References: <894020.13023.qm@web86508.mail.ird.yahoo.com>
From: =?iso-8859-1?Q?Stefan_Sch=E4fer?= <schaefer@hst.tu-darmstadt.de>
To: <rsgb_lf_group@blacksheep.org>
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Subject: LF: VLF_8.79 kHz_grounding systems
Sender: owner-rsgb_lf_group@blacksheep.org
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Reply-To: rsgb_lf_group@blacksheep.org


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Ok Alan, but what is the difference between a ground stake and the alu foi=
l, when talking about the resistive losses? That would be also a poor qual=
ity ohmic connection, isn't it? And think about how many meters of stake=
 you need if you want to have the same C that will be achieved by 5m*30cm=
 Alu foil? How much time and work for a short test.
=20
Perhaps you know my /p radial for 137kHz: It is a simple copper plate of=
 0,2m*25m, so 5m^2. With that configuration i reach <30 Ohm overall losses=
. My coil losses are 13 Ohm, radiation resistance is 0,8 Ohm, wire losses=
 abt 1 Ohm and soil conductivity abt 6mS. This radial is just rolled out=
 on a stony field on the hill, 350m ASL  (see my picture @ qrz.com). While=
 others bury 100s of m of cable and run 10s of meters of earth rods into=
 the ground i achieve earth losses of less than 15 Ohm with just such a pl=
ate. In /p i do not have the nerves and time to roll out 100s of m of radi=
als so i was happy to find, that this a good solution too. In my theory,=
 it is necessary to get a good connection to the ground by a high coupling=
 capacity and that means a high area metallic electrode close above ground=
. Although the area is so much concentrated at the feed point, the results=
 are so good. So i expect that this may be a good solution on VLF as well.=
=20
Trying a cheep alu foil for the household, less than 2EUR for 30m*0,3m sho=
uld be worth for everyone to try if earth losses could be decreased :-) Al=
most no money and/or time is needed :-)
=20
73, Stefan
=20
=20

________________________________

Von: owner-rsgb_lf_group@blacksheep.org im Auftrag von ALAN MELIA
Gesendet: Di 23.02.2010 16:31
An: rsgb_lf_group@blacksheep.org
Betreff: Re: AW: AW: LF: VLF_8.79 kHz



Hi Stefan, my comment was related to the fact that if you support the foil=
 a few inches above the ground that will be fine but you will get a much=
 smaller capacitance. If you bury it or place it on the ground you are rat=
her making a poor quality ohmic connection (lotsa loss!) to the ground and=
 it would be better to ground the end of the wire to a good copper spike=
 like a "half loop". It is also quite difficult to make a good connection=
 to the foil, with a big capacitance there will be a lot of current flowin=
g (hopefully :-)) ).

If you use an HV capacitor you would connect one terminal to the end of th=
e wire and the other to a ground stake. Rik had some comments on this conf=
iguration at 136, but I dont think he ever tried it in practice.

Alan
G3NYK


--- On Tue, 23/2/10, Stefan Sch=E4fer <schaefer@hst.tu-darmstadt.de> wrote=
:

> From: Stefan Sch=E4fer <schaefer@hst.tu-darmstadt.de>
> Subject: AW: AW: LF: VLF_8.79 kHz
> To: rsgb_lf_group@blacksheep.org
> Date: Tuesday, 23 February, 2010, 15:05
> Hi Alan,
>=20
> Well, i expect the oxide film losses of the foil should be
> neglectible, compared to the ground losses. And one has the
> advantege to reach a high C that is easy to adjust/modify
> and cheep and that has no overvoltage and heating problems.
> Aren't the radials of a LF vertical not almost the same, in
> principal? I mean, one electrode of a HV capacitor with a
> lossy dielectricum? ;-)
>=20
> Using a HV capacitor or coax cable is also a good choice,
> of course, but it may be difficult to get proper C at those
> voltages. And if we are talking about connecting the end of
> a inv L antenna to ground (here: soil) the next question is:
> Where do you connect the second electrode of your C? A coax,
> say RG213 may be connected to the antenna wire with the
> inner line. But where do you connect the screen? Bringing it
> back to the shack and connecting to ground would mean not to
> use the soil as the conductor any more and throwing the coax
> just on the bottom would be nonsense since then, one could
> just take a standard wire which is principally almost the
> same like aluminium foil. Using such a simple wire would
> mean to require 100s of m of cable to get the same C. And in
> such a configuration a high C to ground is essential since
> one wants to have a practicable small L for resonance (to
> handle the losses).
>=20
> Therefore i had the idea just to try a real loop that needs
> just a high C with less voltage (probably <1kV).
> If we assume a inv L of 10m hight and 50m horizontal
> section and make a rectangular loop out of it, the XL will
> be in the region of 15 Ohm (?). Then a C of abt 1=B5F will
> resonate the loop. Applying 100W and assuming 2 Ohm losses
> will produce abt 7A and a voltage of 750V above the C, no
> problem to find such a C :-) Starting with a closed loop is
> much easier since no L and maybe even no R transformation is
> necessary. And with a horizontal section of <50m, the
> increased loop area when using the ground/soil may be not
> really much more, but with the disadvantage to need a L with
> a high R and/or less Q...
>=20
>=20
> Markus/DF6NM has also good ideas but i do not want to tell
> his ideas. Markus? Go on! ;-)
>=20
> Stefan/DK7FC
>
> ________________________________
>
> Von: owner-rsgb_lf_group@blacksheep.org
> im Auftrag von ALAN MELIA
> Gesendet: Di 23.02.2010 13:31
> An: rsgb_lf_group@blacksheep.org
> Betreff: Re: AW: LF: VLF_8.79 kHz
>
>
>
> Hi Stefan, I am not sure about your aluminium foil idea. I
> worry that this will form a lossy capacitor because the
> dielectric a think film of ali oxide will break down in
> places at this voltage and also there is the inknown of the
> contact with the ground. I would rather use some UR67 it can
> be a length unsuitable for real feeder work (I uses coax as
> a capacitor in an HV pulse generator many years ago and
> though the spec is 6kV it certainly survived 15kV with no
> burns though the dielectric. Rik and I discussed this format
> at length many years ago for 136kHz but I dont think either
> of us did any tests.
>
> I would suggest an HV capacitor might be the alternative
> old TV EHT type??
>
> Actually grounding the remote ends is a lot easier and a
> lot less to carry if you are operating "portable"
>
> Alan G3NYK


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